Pharmacology

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hisorically, the ___________ was responsible information about the sources, physical and chemical properties, and coumpounding and dispensing of drugs.

clinician

Historically the clinician was responsible for information about what 3 things about drugs?

sources

physical and chemical properties

compounding and dispensing of drugs

Who is now responsible for information about the sources, physical and chemical properties, and compounding and dispensing of drugs?

pharamacologists and pharmacists

What does the practitioner's responsibility relate to today?

the clinical application of this knowledge, they must understand basic principles of pharmacology as they apply to druges used in oral health care as well as other drugs taken by the pt

What are 4 important principles that practitioner's must understand to provide for more efficient communication when explaining drug effects to the patient?

how a drug works (mechanism of action)

side effects or ADEs that are possible

oral health education related to drug

risks of taking a drug

The 4 principles that practitioner's must understand to provide for efficient communication when explaining drug affects pertain to what 3 things?

pharmacodynamics (drug's mechanism of action)

pharmacokinetics (movment of drug through the body)

pharmacotherapeuitc variables (adverse effects of taking drug)

The science of molecular interactions between drugs and body constituents, it relates to the biochemical and physiologic actions of drugs

pharmacodynamics

What are 4 steps that a drug goes through when it is delivered to the tissue cells in pharmacodynamics?

Delivery of molecule to tissue cells

complex formation with receptor (site of action)

molecular event causing an effect

mechanism of action

delivery of molecule to tissue cells

step one of pharmacodynamics of drugs

formation of a complex or bond between the drug molecule and a cell component called the drug receptor

step 2 of pharmacodynamics of drugs

the receptor site where a drug acts to initiate a series of boichemical and physiologic effects is that drugs site of action (molecular event causing an effect)

step 3 of pharamcodynamics of drugs

the molecular event that follows this drug-recepto interaction is called the drug's mechanism of action

step 4 of pharmacodynamics of drugs

true or false. ALL drugs interact with specific receptors to cause an effect.

FALSE. NOT all drugs interact with specific receptors to cause an effect

What is an example of a drug that has a specific receptor to cause an effect?

epinephrine in local anesthetic agents

large, highly specialiezed molecules, which are components of the plasma membrane or are located intracellularly

drug receptors

The idea that drug molecules and their receptors must have similar structures (structural specificity) is described as what?

"lock and key" complementary fits

How many molecules can bind to a receptor at a time?

one!

electropositive or electronegative force that functions to attract the drug molecule to the receptor

electrochemical force feature of receptors

The feature of receptors being _________ or _________ to attract or repel a molecule

hydrophilic

hydrophobic

___________ are cellular macromolecules; which is a defining factor in determining their function

receptors

What are the 7 characteristics of drug receptors listed in box 2-1?

Cellular Macromolecules

Location on the cell surface or within the cell

Hundreds of different receptors on a single cell

Complementary Fit between drug and receptor

Electrochemical Charge

Hydrophilic or Hydrophobic

Only One drug molecule can occupy a receptro at One time

drugs attach to or interacti with these receptor sites through various types of what?

chemical bonds

What are the 4 types of chemical bonds that drugs attach or interact with receptor sites through?

ionic

hydrogen

covalent

van der Waals force

What are the 2 most common types of chemical bonds between drugs and receptors and why?

hydrogen and ionic

they are similar bonds and both involve an electrochemical attractions, they require little energy and are made and broken easily

interactions that occur between atoms with opposite charges

ionic interactions

which type of bonds are weak and easily reversed?

ionic

when bound to nitrogen or oxygen hydrogen atoms become positively poarized and bind to negatively poarized atoms such as oxygen, nitrogen, or sulfur, in what type of chemical bond?

hydrogen

are ionic or hydrogen bonds generally weaker?

hydrogen

the strongest type of bond between a drug and its receptor, resulting from the sharing of electrons by two atoms. The energy required to overcome such interactions can be so great that the bond is often irreversible

covalent bone

What is a good dental example of a covalent bond?

the complex formed between tetracycline and dentin to produce a permanent intrinsic discoloration

nondescript forces contribute to the mutual attraction between organic molecules through a shifting of electron density in or around a molecule that results in the generation of transient positive or negative charges

van der Waals forces

true or false. van der Waals forces provides for a weak attractive force between some drugs and their receptors

true

drug molecules move in constant random motion, binding then releasing the bond, then binding again according to the _______ of the molecule and _________ from other drug molecules